130256781 has 8 divisors (see below), whose sum is σ = 173763360. Its totient is φ = 86794032.

The previous prime is 130256779. The next prime is 130256783. The reversal of 130256781 is 187652031.

It is an interprime number because it is at equal distance from previous prime (130256779) and next prime (130256783).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 130256781 - 2¹ = 130256779 is a prime.

It is a super-2 number, since 2×130256781² = 33933657992963922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130256783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3246 + ... + 16463.

It is an arithmetic number, because the mean of its divisors is an integer number (21720420).

Almost surely, 2^130256781 is an apocalyptic number.

It is an amenable number.

130256781 is a deficient number, since it is larger than the sum of its proper divisors (43506579).

130256781 is a wasteful number, since it uses less digits than its factorization.

130256781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21915.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 130256781 is about 11413.0092876507. The cubic root of 130256781 is about 506.9130211150.

The spelling of 130256781 in words is "one hundred thirty million, two hundred fifty-six thousand, seven hundred eighty-one".